21332902505 has 4 divisors (see below), whose sum is σ = 25599483012. Its totient is φ = 17066322000.

The previous prime is 21332902501. The next prime is 21332902543. The reversal of 21332902505 is 50520923312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10400736256 + 10932166249 = 101984^2 + 104557^2 .

It is not a de Polignac number, because 21332902505 - 2² = 21332902501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21332902501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2133290246 + ... + 2133290255.

It is an arithmetic number, because the mean of its divisors is an integer number (6399870753).

Almost surely, 2^21332902505 is an apocalyptic number.

It is an amenable number.

21332902505 is a deficient number, since it is larger than the sum of its proper divisors (4266580507).

21332902505 is an equidigital number, since it uses as much as digits as its factorization.

21332902505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4266580506.

The product of its (nonzero) digits is 16200, while the sum is 32.

The spelling of 21332902505 in words is "twenty-one billion, three hundred thirty-two million, nine hundred two thousand, five hundred five".